Android: how to get image from url


To learn how to get image from url, we create a simple example.

Step 1: create new android project.

Step 2: file AndroidManifest.xml

add:

<uses-permission android:name="android.permission.INTERNET" />

Step 3: create the main layout: res\layout\activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.tutorialspots.getimage.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TUTORIALSPOTS.COM"
        android:textColor="#FF0000"
        android:textSize="30dp"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:id="@+id/textView" />

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView"
        android:layout_below="@+id/textView"
        android:layout_centerHorizontal="true" />
</RelativeLayout>

android load image from url

Step 4: create new class ImageViewHelper.java

package com.tutorialspots.getimage;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * Created by Tutorialspots on 1/10/2016.
 */
public class ImageViewHelper {
    public static Bitmap getBitmapFromURL(String src) {
        try {
            URL url = new URL(src);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            // Sets the flag indicating whether this URLConnection allows input.
            connection.setDoInput(true);
            connection.connect();
            InputStream inputStream = connection.getInputStream();
            Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
            return bitmap;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
}

Step 5: file MainActivity.java

Method 1:

package com.tutorialspots.getimage;

import android.graphics.Bitmap;
import android.os.StrictMode;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    String url = "http://tutorialspots.com/wp-content/uploads/2013/04/1.png";
    ImageView imageView;
    Bitmap bitmap;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);

        imageView = (ImageView) findViewById(R.id.imageView);
        bitmap = ImageViewHelper.getBitmapFromURL(url);
        
        if(bitmap == null)
            Toast.makeText(getApplicationContext(), "Can't get image from url", Toast.LENGTH_LONG).show();
        else
            imageView.setImageBitmap(bitmap);
    }
      
}

Note: if you don’t use the code:

        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);

You will get the error:

01-09 18:27:18.593 20909-20909/com.tutorialspots.getimage W/System.err: android.os.NetworkOnMainThreadException
01-09 18:27:18.593 20909-20909/com.tutorialspots.getimage W/System.err:     at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
01-09 18:27:18.593 20909-20909/com.tutorialspots.getimage W/System.err:     at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
01-09 18:27:18.593 20909-20909/com.tutorialspots.getimage W/System.err:     at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
01-09 18:27:18.593 20909-20909/com.tutorialspots.getimage W/System.err:     at java.net.InetAddress.getAllByName(InetAddress.java:214)
01-09 18:27:18.593 20909-20909/com.tutorialspots.getimage W/System.err:     at libcore.net.http.HttpConnection.<init>(HttpConnection.java:70)
01-09 18:27:18.593 20909-20909/com.tutorialspots.getimage W/System.err:     at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
01-09 18:27:18.593 20909-20909/com.tutorialspots.getimage W/System.err:     at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340)
01-09 18:27:18.593 20909-20909/com.tutorialspots.getimage W/System.err:     at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
01-09 18:27:18.593 20909-20909/com.tutorialspots.getimage W/System.err:     at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
01-09 18:27:18.593 20909-20909/com.tutorialspots.getimage W/System.err:     at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:316)
01-09 18:27:18.593 20909-20909/com.tutorialspots.getimage W/System.err:     at libcore.net.http.HttpEngine.connect(HttpEngine.java:311)
01-09 18:27:18.593 20909-20909/com.tutorialspots.getimage W/System.err:     at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:290)
01-09 18:27:18.593 20909-20909/com.tutorialspots.getimage W/System.err:     at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:240)
01-09 18:27:18.593 20909-20909/com.tutorialspots.getimage W/System.err:     at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:81)
01-09 18:27:18.593 20909-20909/com.tutorialspots.getimage W/System.err:     at com.tutorialspots.getimage.ImageViewHelper.getBitmapFromURL(ImageViewHelper.java:21)
01-09 18:27:18.593 20909-20909/com.tutorialspots.getimage W/System.err:     at com.tutorialspots.getimage.MainActivity.onCreate(MainActivity.java:20)
01-09 18:27:18.593 20909-20909/com.tutorialspots.getimage W/System.err:     at android.app.Activity.performCreate(Activity.java:5104)
01-09 18:27:18.593 20909-20909/com.tutorialspots.getimage W/System.err:     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
01-09 18:27:18.593 20909-20909/com.tutorialspots.getimage W/System.err:     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
01-09 18:27:18.597 20909-20909/com.tutorialspots.getimage W/System.err:     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
01-09 18:27:18.597 20909-20909/com.tutorialspots.getimage W/System.err:     at android.app.ActivityThread.access$600(ActivityThread.java:141)
01-09 18:27:18.597 20909-20909/com.tutorialspots.getimage W/System.err:     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
01-09 18:27:18.597 20909-20909/com.tutorialspots.getimage W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:99)
01-09 18:27:18.597 20909-20909/com.tutorialspots.getimage W/System.err:     at android.os.Looper.loop(Looper.java:137)
01-09 18:27:18.597 20909-20909/com.tutorialspots.getimage W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:5041)
01-09 18:27:18.597 20909-20909/com.tutorialspots.getimage W/System.err:     at java.lang.reflect.Method.invokeNative(Native Method)
01-09 18:27:18.597 20909-20909/com.tutorialspots.getimage W/System.err:     at java.lang.reflect.Method.invoke(Method.java:511)
01-09 18:27:18.597 20909-20909/com.tutorialspots.getimage W/System.err:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
01-09 18:27:18.597 20909-20909/com.tutorialspots.getimage W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
01-09 18:27:18.597 20909-20909/com.tutorialspots.getimage W/System.err:     at dalvik.system.NativeStart.main(Native Method)

Method 2: use AsyncTask

package com.tutorialspots.getimage;

import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    String url = "http://tutorialspots.com/wp-content/uploads/2013/04/1.png";
    ImageView imageView;
    Bitmap bitmap;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        imageView = (ImageView) findViewById(R.id.imageView);

        ImageLoadAsyncTask imageLoadAsyncTask = new ImageLoadAsyncTask();
        imageLoadAsyncTask.execute(new String[]{url});
    }

    public class ImageLoadAsyncTask extends AsyncTask<String, Void, String>{

        @Override
        protected String doInBackground(String... strings) {
            bitmap = ImageViewHelper.getBitmapFromURL(strings[0]);
            return null;
        }

        @Override
        protected void onPostExecute(String s) {
            if(bitmap == null)
                Toast.makeText(getApplicationContext(), "Can't get image from url", Toast.LENGTH_LONG).show();
            else
                imageView.setImageBitmap(bitmap);
        }

    }
}

Step 6: run for test:

android load image from url 2

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